Flutter报错：There are multiple her

详情错误信息

The following assertion was thrown during a scheduler callback:

There are multiple heroes that share the same tag within a subtree.

Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), each Hero must have a unique non-null tag.

In this case, multiple heroes had the following tag: Default Hero tag for Cupertino navigation bars with navigator NavigatorState#ee56c(tickers: tracking 2 tickers)

Here is the subtree for one of the offending heroes: Hero

  tag: Default Hero tag for Cupertino navigation bars with navigator NavigatorState#ee56c(tickers: tracking 2 tickers)

  state: _HeroState#150ea

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实现功能：在列表页面点击单元格push到详情页面时报错。

从错误详情中可以获取到是因为Hero tag重复造成的。（Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), each Hero must have a unique non-null tag.）奇怪的是项目中就没有使用过Hero功能，为什么会报重复错误呢？

从更进一步的错误信息中捕捉到和navigator有关系（Default Hero tag for Cupertino navigation bars with navigator NavigatorState#ee56c(tickers: tracking 2 tickers)）。项目选用的是Cupertino风格，确实使用到了navgation,赶紧把每个模块的pageWidget中的navigationBar都配置一遍，如下：

pageWidget配置navigation

每个page模块的 navitaionBar中都配置了不同的heroTag值。然后运行发现还是报该错误；这就奇怪了，再继续找项目中的navigationBar,最后再main.dart中找到了原因。在搭建项目结构的时候，CupertinoTabBar构建每一个CupertinoPageScaffold时，统一添加了navigationBar,并且没有进行HeroTag区分。

CupertinoTabBar构建CupertinoPageScaffold的错误配置

最后，都每一个navigationBar进行了heroTag区分，问题成功解决！